Evaluation of a photon-counting hybrid pixel detector array with a synchrotron X-ray source

A photon-counting hybrid pixel detector (Medipix-1) has been characterized using a synchrotron X-ray source. The detector consists of a readout ASIC with 64 x 64 independent photon-counting cells of 170 x 170 mum(2) pitch, bump-bonded to a 300 mum thick silicon sensor, read out by a PCIbus-based electronics, and a graphical user interface (GUI) software. The intensity and the energy tunability of the X-ray source allow characterization of the detector in the time, space, and energy domains. The system can be read out on external trigger at a frame rate of 100 Hz with 3 ms exposure time per frame. The detector response is tested up to more than 7 x 10(5) detected events/pixel/s. The point-spread response shows < 2% crosstalk between neighboring pixels. Fine scanning of the detector surface with a 10 mum beam reveals no loss in sensitivity between adjacent pixels as could result from charge sharing in the silicon sensor. Photons down to 6 keV can be detected after equalization of the thresholds of individual pixels, The obtained results demonstrate the advantages of photon-counting hybrid pixel detectors and particularly of the Medipix-1 chip for a wide range of X-ray imaging applications, including those using synchrotron X-ray beams. (C) 2001 Elsevier Science B.V. All rights reserved.